5 things millionaires can't afford - that truly wealthy people can

Like yachts, private jets also cost much more than their (already high) purchase price. Jeff Bezos' Gulfstream G650ER jet cost an estimated $65 million, and Mark Cuban spent $40 million on a Gulfstream V jet back in 1999, Business Insider's Paige Leskin reported.

But paying for fuel, maintenance, and pilot salaries can total to more than $1 million per year, Chris Battaglia, the director of charter sales at Meridian Aviation at New Jersey's Teterboro Airport, previously told Business Insider's Katie Warren. Pilot salaries can add up to $750,000 per year and hangar fees can run around $200,000 per year.

"Having an airplane is not for millionaires," Battaglia said. "It's for guys worth $50, $60, $100 million."

In 2014, Steve Ballmer paid $2 billion for the Los Angeles Clippers, nearly four times the team's perceived value at the time. It's helped reset the market for what franchises are worth, reported Business Insider's Cork Gaines.

Since then, pro sports team sale prices over $1 billion have become more common, he wrote, but relative deals still exist. They've sold for anywhere from $25 million to $2.2 billion, depending on the league and franchise.

According to Darren Geeter of CNBC, it can cost over $1 billion to buy an NFL team today.

Millionaires may be able to hire some help around the house, but they can't hire all the help. Business Insider's Tanza Loudenback previously spoke with David Youdovin, founder and CEO of Hire Society, a recruitment firm that helps high-net-worth individuals and families staff their homes and businesses.

Youdovin shed some insight on the most common positions wealthy families are looking to hire for, and how much they pay annually. A full-time staff would include a chief of staff, management team, butler, assistant, chef, housekeeper, nanny, tutor, chauffeur, and houseman.

Depending on level of experience, that could range from $1.03 million to $2.4 million a year — and that's not including health benefits and bonuses.

It takes a lot of money to prepare well for the apocalypse.

Superrich Silicon Valley moguls are buying millions of dollars' worth of doomsday bunkers and installing them in New Zealand, reported Olivia Carville for Bloomberg. The most expensive cost $8 million.

Companies have been building "billionaire bunkers" that cater to the apocalyptic fears of the superrich, Business Insider's Aria Bendix reported. These high-end bunkers can cost nearly $20 million to build and are outfitted with luxury amenities: think swimming pools, movie theaters, gyms, rock climbing walls, dog parks, game rooms, and indoor pools.

At $20 million, the cost of preparing for the end of the world is out of reach for the low-level millionaire. That means that if doomsday does arrive, billionaires will be in good company: each others'.